{"id":"CVE-2026-104912","summary":"MISP Correlation Authorization Bypass Exposes Restricted Event and Attribute Data","details":"MISP contains an authorization flaw in its correlation handling during attribute searches. When a user performs an attribute search that triggers correlation lookups, the system authorized access to correlated attributes and events based on a stale distribution snapshot stored on the correlation row rather than the live event access control list.\n\nBecause the correlation row's distribution columns are a point-in-time copy that lacks a published flag, the authorization check becomes incorrect when an event is subsequently restricted (for example, its sharing group is changed or it is unpublished). As a result, an authenticated user could retrieve attributes and event details belonging to events they no longer have permission to view.\n\nPreconditions:\n\n- An authenticated user with at least read access to some events in the instance.\n\n- The existence of correlations between events, at least one of which has been restricted after the correlation was created.\n\nImpact:\n\n- Confidentiality: exposure of attribute values and event metadata that the user is not authorized to access.\n\nAffected versions: MISP prior to v2.5.48.","modified":"2026-10-05T02:30:30.010182850Z","published":"2026-10-02T16:04:50.580Z","database_specific":{"cna_assigner":"CIRCL","cwe_ids":["CWE-284","CWE-862"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104912.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104912.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-104912"},{"type":"FIX","url":"https://github.com/MISP/MISP/commit/100235bd9"},{"type":"PACKAGE","url":"https://github.com/MISP/MISP"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/misp/misp","events":[{"introduced":"0"},{"fixed":"100235bd9"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2.5.48"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-104912.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}]}